本科毕设论文--耙头二维的流场的模拟与分析.docVIP

摘 要 随着疏浚船舶向现代化、大型化发展 Abstract With the development of the modern, large-scale dredging ship, the demands for high-performance liquid pressing machine are becoming bigger and bigger in the dredging area, but the traditional theoretical analysis and pure experimental study of fluid mechanical problems have great limitations. At this point, with the emergence of the high-speed, large capacity and low-cost computers, computational fluid dynamics appeared and got a deep study, the reliability, accuracy and computational efficiency of the theory had also been greatly improved. CFD method has several features. These features are the initial performance prediction, the internal flow prediction, numerical experiments, flow diagnostics and the role of exterior design. CFD software has become an important means to Compute and study practical fluids problems now. This paper involved numerical calculation of rakes in the two-dimensional flow field with the CFD software. The main contents involves knowing the dredging technology、dredging equipment and basic knowledge well, learning a kind of computational fluid dynamics software, which is called FLUENT, understanding the method to divide the mesh and method to set up the boundary condition and using CFD software to calculate the flow field of the pressure and velocity in the two-dimensional flow field under the condition of the known geometry and boundary conditions of the rake head. The method of study is to use CAD and software Gambit to divide the mesh and use computational fluid dynamics software FLUENT to finish the calculations. Finally, the paper finishes the comparison among different two-dimensional flow fields of rake head under several kinds of velocity, proposes own views about the relations between flow field and velocity and gives some suggestions about improvement of the rake head shape with Analysis of flow field. By the two-dimensional flow simulation and analysis of the rake head, we understand the distributi